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Coquandite

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Formula:
Sb6+xO8+x(SO4)(OH)x(H2O)1- x (x = 0.3)
Originally assumed to be (SbO)6(SO4)O2.H2O.
System:
Triclinic
Colour:
colorless
Hardness:
3 - 4
Name:
In honour of the French scientist Henri Coquand (1811/13-1881), Professor of geology and mineralogy, who carried out extensive studies of the antimony deposits of Tuscany between 1842 and 1849.
This page provides mineralogical data about Coquandite.

Classification of Coquandite

Approved
Approval Year:
1991
7.DE.35

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
E : With only medium-sized cations; unclassified
30.1.18.1

30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO4)pZq, where m:p>2:1
25.8.2

25 : Sulphates
8 : Sulphates of Sb, V, Cr and U
mindat.org URL:
http://www.mindat.org/min-1125.html
Please feel free to link to this page.

Type Occurrence of Coquandite

Place of Conservation of Type Material:
National Museum of Natural History, Smithsonian Institution in Washington, and at Museums of Natural History of the Universities of Florence and Pisa (catalogue numbers l761/RI
and 8800, respectively).
Geological Setting of Type Material:
Oxidized stibnite deposit

Physical Properties of Coquandite

Adamantine
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
colorless
Streak:
white
Hardness (Mohs):
3 - 4
Tenacity:
Flexible
Cleavage:
None Observed
Density:
5.78 g/cm3 (Calculated)

Crystallography of Coquandite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 11.4292(5) Å, b = 29.772(1) Å, c = 11.2989(5) Å
α = 91.152(3)°, β = 119.266(4)°, γ = 92.624(3)°
Ratio:
a:b:c = 0.384 : 1 : 0.38
Unit Cell Volume:
V 3,346.44 ų (Calculated from Unit Cell)
Z:
10
Morphology:
Tabular crystals

Optical Data of Coquandite

Type:
Biaxial (+)
Dispersion:
r < v strong
Comments:
Small size and high RI made optical determinations difficult.

Chemical Properties of Coquandite

Formula:
Sb6+xO8+x(SO4)(OH)x(H2O)1- x (x = 0.3)

Originally assumed to be (SbO)6(SO4)O2.H2O.
All elements listed in formula:

Relationship of Coquandite to other Species

7.DE.05MangazeiteAl2(SO4)(OH)4 · 3H2O
7.DE.10CarbonatecyanotrichiteCu4Al2(CO3,SO4)(OH)12 · 2H2O
7.DE.10CyanotrichiteCu4Al2(SO4)(OH)12 · 2H2O
7.DE.10UKI-1975-(SO:AlCu)(Cu, Al, SO4, H2O)
7.DE.15SchwertmanniteFe163+(OH,SO4)12-13O16 · 10-12H2O
7.DE.20TlalociteCu10Zn6(Te6+O4)2(Te4+O3)(OH)25Cl · 27H2O
7.DE.25UtahiteCu5Zn3(TeO4)4(OH)8 · 7H2O
7.DE.40OsakaiteZn4(SO4)(OH)6 · 5H2O
7.DE.45WilcoxiteMgAl(SO4)2F · 17H2O
7.DE.50Stanleyite(V4+O)(SO4) · 6H2O
7.DE.55McalpineiteCu3(Te6+O6)
7.DE.60HydrobasaluminiteAl4(SO4)(OH)10 · 12-36H2O
7.DE.62VolaschioiteFe4(SO4)O2(OH)6 · 2H2O
7.DE.65ZaheriteAl12(SO4)5(OH)26 · 20H2O
7.DE.70LautenthalitePbCu4(SO4)2(OH)6 · 3H2O
7.DE.75CamérolaiteCu6Al3(OH)18(H2O)2[Sb(OH)6](SO4)
25.8.1KlebelsbergiteSb4O4(SO4)(OH)2
25.8.3PeretaiteCa(SbO)4(SO4)2(OH)2 · 2H2O
25.8.4CannoniteBi2(SO4)O(OH)2
25.8.5Minasragrite(V4+O)(SO4) · 5H2O
25.8.6Stanleyite(V4+O)(SO4) · 6H2O
25.8.7Redingtonite(Fe2+,Mg,Ni)(Cr,Al)2(SO4)4·22H2O
25.8.8Metauranopilite(UO2)6(SO4)(OH)10 · 5H2O
25.8.9Uranopilite(UO2)6(SO4)O2(OH)6 · 14H2O
25.8.10NatrozippeiteNa5(UO2)8(SO4)4O5(OH)3 · 12H2O
25.8.11ZippeiteK3(UO2)4(SO4)2O3(OH) · 3H2O
25.8.12JohanniteCu(UO2)2(SO4)2(OH)2 · 8H2O
25.8.13MagnesiozippeiteMg(UO2)2(SO4)O2 · 3.5H2O
25.8.14ZinczippeiteZn(UO2)2(SO4)O2 · 3.5H2O

Other Names for Coquandite

Name in Other Languages:
German:Coquandit
Spanish:Coquandita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Coquandite

Reference List:
New Minerals (1997), New Minerals 1990-1994.

Sabelli C, Orlandi P, Vezzalini G (1992) Coquandite, Sb6O8(SO4)·H2O, a new mineral from Pereta, Tuscany, Italy, and two other localities. Mineralogical Magazine 56, 599-603

Bindi, L., Biagioni, C., Ceccantini, L., Batoni, M., & Menchetti, S. (2014). Coquandite, Sb6+ x O8+ x (SO4)(OH) x·(H2O) 1–x (x= 0.3), from the Cetine mine, Tuscany, Italy: crystal structure and revision of the chemical formula. Mineralogical Magazine, 78(4), 871-888.

Internet Links for Coquandite

Localities for Coquandite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Italy (TL)
 
  • Tuscany
    • Grosseto Province
      • Scansano
        • Pereta
Sabelli C, Orlandi P, Vezzalini G (1992) Coquandite, Sb6O8(SO4)·H2O, a new mineral from Pereta, Tuscany, Italy, and two other localities. Mineralogical Magazine 56, 599-603
    • Pisa Province
      • Pomarance
Orlandi, P. (1997): Zibaldone di mineralogia italiana. Rivista Mineralogica Italiana, 21, 179-185. ; Bardi, T., Biagioni, C., & Orlandi, P. (2009). Aggiornamento sui minerali della Sorgente Solfurea di Micciano (Pomarance, Pisa, Toscana). MICRO (località), 1/2009, 261-276.
    • Siena Province
      • Chiusdino
Lapis Magazine Vol 6.1993 Page 22; Menchetti, S., Batoni, M., Batacchi, C., Borselli, G., Brogi, A., Ceccantini, L., Fassina, B., Marchesini, M., Rossellini, A. & Ruggieri, G. (2015): Le Cetine di Cotorniano. Miniera e minerali. Associazione Micro-Mineralogica Italiana, Cremona, 354 p.
Japan
 
  • Shikoku Island
    • Ehime Prefecture
      • Saijo City
specimens seen at Kyoto show, 2010
Luxembourg
 
  • Goesdorf commune
    • Goesdorf
Simon Philippo analysis (to be published); [Filella M., Philippo S., Belzile N., Chen Y. and Quentel F. (2009) Natural attenuation processes applying to antimony: A study in the abandoned antimony mine in Goesdorf, Luxembourg - Science of the total environment (in press)]
Portugal
 
  • Porto District
    • Gondomar
      • Medas
Roper, A. J., Leverett, P., Murphy, T. D., Williams, P. A., & Hibbs, D. E. (2015). Klebelsbergite, Sb4O4SO4 (OH) 2: Stability relationships, formation in Nature, and refinement of its structure. American Mineralogist, 100(2-3), 602-607.
Romania
 
  • Maramureș Co.
Gabor Koller specimens
collected: Gábor Koller, analysed: Sándor Szakáll, Béla Fehér EDS, and PXRD
Gábor Koller collection (EDS- and PXRD-analysed by Sándor Szakáll and Béla Fehér)
USA (TL)
 
  • Washington
    • Okanogan Co.
      • Tonasket
        • Whitestone Coulee
Mineralogical Magazine: 56:599-603.
Mineral and/or Locality  
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